On 2019/9/18 0:00, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>
>
> The virtio-fs virtio device provides shared file system access using
> the FUSE protocol carried over virtio.
> The actual file server is implemented in an external vhost-user-fs device
> backend process.
>
> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
> Signed-off-by: Sebastien Boeuf <sebastien.bo...@intel.com>
> Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
> ---
> configure | 13 ++
> hw/virtio/Makefile.objs | 1 +
> hw/virtio/vhost-user-fs.c | 299 ++++++++++++++++++++++++++++++
> include/hw/virtio/vhost-user-fs.h | 45 +++++
> 4 files changed, 358 insertions(+)
> create mode 100644 hw/virtio/vhost-user-fs.c
> create mode 100644 include/hw/virtio/vhost-user-fs.h
>
> diff --git a/configure b/configure
> index 30aad233d1..1bd7b40d49 100755
> --- a/configure
> +++ b/configure
> @@ -382,6 +382,7 @@ vhost_crypto=""
> vhost_scsi=""
> vhost_vsock=""
> vhost_user=""
> +vhost_user_fs=""
> kvm="no"
> hax="no"
> hvf="no"
> @@ -1294,6 +1295,10 @@ for opt do
> ;;
> --enable-vhost-vsock) vhost_vsock="yes"
> ;;
> + --disable-vhost-user-fs) vhost_user_fs="no"
> + ;;
> + --enable-vhost-user-fs) vhost_user_fs="yes"
> + ;;
> --disable-opengl) opengl="no"
> ;;
> --enable-opengl) opengl="yes"
> @@ -2232,6 +2237,10 @@ test "$vhost_crypto" = "" && vhost_crypto=$vhost_user
> if test "$vhost_crypto" = "yes" && test "$vhost_user" = "no"; then
> error_exit "--enable-vhost-crypto requires --enable-vhost-user"
> fi
> +test "$vhost_user_fs" = "" && vhost_user_fs=$vhost_user
> +if test "$vhost_user_fs" = "yes" && test "$vhost_user" = "no"; then
> + error_exit "--enable-vhost-user-fs requires --enable-vhost-user"
> +fi
>
> # OR the vhost-kernel and vhost-user values for simplicity
> if test "$vhost_net" = ""; then
> @@ -6374,6 +6383,7 @@ echo "vhost-crypto support $vhost_crypto"
> echo "vhost-scsi support $vhost_scsi"
> echo "vhost-vsock support $vhost_vsock"
> echo "vhost-user support $vhost_user"
> +echo "vhost-user-fs support $vhost_user_fs"
> echo "Trace backends $trace_backends"
> if have_backend "simple"; then
> echo "Trace output file $trace_file-<pid>"
> @@ -6873,6 +6883,9 @@ fi
> if test "$vhost_user" = "yes" ; then
> echo "CONFIG_VHOST_USER=y" >> $config_host_mak
> fi
> +if test "$vhost_user_fs" = "yes" ; then
> + echo "CONFIG_VHOST_USER_FS=y" >> $config_host_mak
> +fi
> if test "$blobs" = "yes" ; then
> echo "INSTALL_BLOBS=yes" >> $config_host_mak
> fi
> diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
> index 964ce78607..47ffbf22c4 100644
> --- a/hw/virtio/Makefile.objs
> +++ b/hw/virtio/Makefile.objs
> @@ -11,6 +11,7 @@ common-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
> common-obj-$(CONFIG_VIRTIO_MMIO) += virtio-mmio.o
> obj-$(CONFIG_VIRTIO_BALLOON) += virtio-balloon.o
> obj-$(CONFIG_VIRTIO_CRYPTO) += virtio-crypto.o
> +obj-$(CONFIG_VHOST_USER_FS) += vhost-user-fs.o
> obj-$(call land,$(CONFIG_VIRTIO_CRYPTO),$(CONFIG_VIRTIO_PCI)) +=
> virtio-crypto-pci.o
> obj-$(CONFIG_VIRTIO_PMEM) += virtio-pmem.o
> common-obj-$(call land,$(CONFIG_VIRTIO_PMEM),$(CONFIG_VIRTIO_PCI)) +=
> virtio-pmem-pci.o
> diff --git a/hw/virtio/vhost-user-fs.c b/hw/virtio/vhost-user-fs.c
> new file mode 100644
> index 0000000000..f0df7f4746
> --- /dev/null
> +++ b/hw/virtio/vhost-user-fs.c
> @@ -0,0 +1,299 @@
> +/*
> + * Vhost-user filesystem virtio device
> + *
> + * Copyright 2018-2019 Red Hat, Inc.
> + *
> + * Authors:
> + * Stefan Hajnoczi <stefa...@redhat.com>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or
> + * (at your option) any later version. See the COPYING file in the
> + * top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include <sys/ioctl.h>
> +#include "standard-headers/linux/virtio_fs.h"
> +#include "qapi/error.h"
> +#include "hw/qdev-properties.h"
> +#include "hw/virtio/virtio-bus.h"
> +#include "hw/virtio/virtio-access.h"
> +#include "qemu/error-report.h"
> +#include "hw/virtio/vhost-user-fs.h"
> +#include "monitor/monitor.h"
> +
> +static void vuf_get_config(VirtIODevice *vdev, uint8_t *config)
> +{
> + VHostUserFS *fs = VHOST_USER_FS(vdev);
> + struct virtio_fs_config fscfg = {};
> +
> + memcpy((char *)fscfg.tag, fs->conf.tag,
> + MIN(strlen(fs->conf.tag) + 1, sizeof(fscfg.tag)));
> +
> + virtio_stl_p(vdev, &fscfg.num_request_queues,
> fs->conf.num_request_queues);
> +
> + memcpy(config, &fscfg, sizeof(fscfg));
> +}
> +
> +static void vuf_start(VirtIODevice *vdev)
> +{
> + VHostUserFS *fs = VHOST_USER_FS(vdev);
> + BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
> + VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
> + int ret;
> + int i;
> +
> + if (!k->set_guest_notifiers) {
> + error_report("binding does not support guest notifiers");
> + return;
> + }
> +
> + ret = vhost_dev_enable_notifiers(&fs->vhost_dev, vdev);
> + if (ret < 0) {
> + error_report("Error enabling host notifiers: %d", -ret);
> + return;
> + }
> +
> + ret = k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, true);
> + if (ret < 0) {
> + error_report("Error binding guest notifier: %d", -ret);
> + goto err_host_notifiers;
> + }
> +
> + fs->vhost_dev.acked_features = vdev->guest_features;
> + ret = vhost_dev_start(&fs->vhost_dev, vdev);
> + if (ret < 0) {
> + error_report("Error starting vhost: %d", -ret);
> + goto err_guest_notifiers;
> + }
> +
> + /*
> + * guest_notifier_mask/pending not used yet, so just unmask
> + * everything here. virtio-pci will do the right thing by
> + * enabling/disabling irqfd.
> + */
> + for (i = 0; i < fs->vhost_dev.nvqs; i++) {
> + vhost_virtqueue_mask(&fs->vhost_dev, vdev, i, false);
> + }
> +
> + return;
> +
> +err_guest_notifiers:
> + k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, false);
> +err_host_notifiers:
> + vhost_dev_disable_notifiers(&fs->vhost_dev, vdev);
> +}
> +
> +static void vuf_stop(VirtIODevice *vdev)
> +{
> + VHostUserFS *fs = VHOST_USER_FS(vdev);
> + BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
> + VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
> + int ret;
> +
> + if (!k->set_guest_notifiers) {
> + return;
> + }
> +
> + vhost_dev_stop(&fs->vhost_dev, vdev);
> +
> + ret = k->set_guest_notifiers(qbus->parent, fs->vhost_dev.nvqs, false);
> + if (ret < 0) {
> + error_report("vhost guest notifier cleanup failed: %d", ret);
> + return;
> + }
> +
> + vhost_dev_disable_notifiers(&fs->vhost_dev, vdev);
> +}
> +
> +static void vuf_set_status(VirtIODevice *vdev, uint8_t status)
> +{
> + VHostUserFS *fs = VHOST_USER_FS(vdev);
> + bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
> +
> + if (!vdev->vm_running) {
> + should_start = false;
> + }
> +
> + if (fs->vhost_dev.started == should_start) {
> + return;
> + }
> +
> + if (should_start) {
> + vuf_start(vdev);
> + } else {
> + vuf_stop(vdev);
> + }
> +}
> +
> +static uint64_t vuf_get_features(VirtIODevice *vdev,
> + uint64_t requested_features,
> + Error **errp)
> +{
> + /* No feature bits used yet */
> + return requested_features;
> +}
> +
> +static void vuf_handle_output(VirtIODevice *vdev, VirtQueue *vq)
> +{
> + /*
> + * Not normally called; it's the daemon that handles the queue;
> + * however virtio's cleanup path can call this.
> + */
> +}
> +
> +static void vuf_guest_notifier_mask(VirtIODevice *vdev, int idx,
> + bool mask)
> +{
> + VHostUserFS *fs = VHOST_USER_FS(vdev);
> +
> + vhost_virtqueue_mask(&fs->vhost_dev, vdev, idx, mask);
> +}
> +
> +static bool vuf_guest_notifier_pending(VirtIODevice *vdev, int idx)
> +{
> + VHostUserFS *fs = VHOST_USER_FS(vdev);
> +
> + return vhost_virtqueue_pending(&fs->vhost_dev, idx);
> +}
> +
> +static void vuf_device_realize(DeviceState *dev, Error **errp)
> +{
> + VirtIODevice *vdev = VIRTIO_DEVICE(dev);
> + VHostUserFS *fs = VHOST_USER_FS(dev);
> + unsigned int i;
> + size_t len;
> + int ret;
> +
> + if (!fs->conf.chardev.chr) {
> + error_setg(errp, "missing chardev");
> + return;
> + }
> +
> + if (!fs->conf.tag) {
> + error_setg(errp, "missing tag property");
> + return;
> + }
> + len = strlen(fs->conf.tag);
> + if (len == 0) {
> + error_setg(errp, "tag property cannot be empty");
> + return;
> + }
> + if (len > sizeof_field(struct virtio_fs_config, tag)) {
> + error_setg(errp, "tag property must be %zu bytes or less",
> + sizeof_field(struct virtio_fs_config, tag));
> + return;
> + }
> +
> + if (fs->conf.num_request_queues == 0) {
> + error_setg(errp, "num-request-queues property must be larger than
> 0");
> + return;
> + }
> +
> + if (!is_power_of_2(fs->conf.queue_size)) {
> + error_setg(errp, "queue-size property must be a power of 2");
> + return;
> + }
> +
> + if (fs->conf.queue_size > VIRTQUEUE_MAX_SIZE) {
> + error_setg(errp, "queue-size property must be %u or smaller",
> + VIRTQUEUE_MAX_SIZE);
> + return;
> + }
> +
> + if (!vhost_user_init(&fs->vhost_user, &fs->conf.chardev, errp)) {
> + return;
> + }
> +
> + virtio_init(vdev, "vhost-user-fs", VIRTIO_ID_FS,
> + sizeof(struct virtio_fs_config));
> +
> + /* Hiprio queue */
> + virtio_add_queue(vdev, fs->conf.queue_size, vuf_handle_output);
> +
> + /* Request queues */
> + for (i = 0; i < fs->conf.num_request_queues; i++) {
> + virtio_add_queue(vdev, fs->conf.queue_size, vuf_handle_output);
> + }
> +
> + /* 1 high prio queue, plus the number configured */
> + fs->vhost_dev.nvqs = 1 + fs->conf.num_request_queues;
> + fs->vhost_dev.vqs = g_new0(struct vhost_virtqueue, fs->vhost_dev.nvqs);
> + ret = vhost_dev_init(&fs->vhost_dev, &fs->vhost_user,
> + VHOST_BACKEND_TYPE_USER, 0);
> + if (ret < 0) {
> + error_setg_errno(errp, -ret, "vhost_dev_init failed");
> + goto err_virtio;
> + }
> +
> + return;
> +
> +err_virtio:
> + vhost_user_cleanup(&fs->vhost_user);
> + virtio_cleanup(vdev);
> + g_free(fs->vhost_dev.vqs);
Adding 'fs->vhost_dev.vqs = NULL;' looks better.
Jun
